CN211994213U

CN211994213U - Full-automatic calibration system of laser scanning rapid prototyping equipment

Info

Publication number: CN211994213U
Application number: CN201921614725.4U
Authority: CN
Inventors: 杨金军
Original assignee: Xi'an Junwang Network Technology Co ltd
Current assignee: Xi'an Junwang Network Technology Co ltd
Priority date: 2019-09-26
Filing date: 2019-09-26
Publication date: 2020-11-24
Anticipated expiration: 2029-09-26

Abstract

The utility model relates to a full-automatic calibration system of laser scanning rapid prototyping equipment has controller, laser instrument, base plate, mirror, face scanner shake. The controller controls the laser to emit laser; the laser is controlled by the vibrating mirror to strike the substrate, and a scanning pattern is presented on the substrate; the surface scanner collects and processes the scanning pattern information on the substrate and outputs a calibration file. The utility model discloses can accomplish the full-automatic calibration of laser scanning rapid prototyping equipment, the simple high efficiency of calibration process, and avoided the injury that laser led to the fact the people's eye.

Description

Full-automatic calibration system of laser scanning rapid prototyping equipment

Technical Field

The utility model relates to a quick forming technique that 3D printed, concretely relates to full-automatic calibration system of laser scanning quick forming equipment.

Background

For 3D printing, the accurate calibration of a laser scanning system is the guarantee of the printing accuracy of the laser scanning rapid prototyping equipment.

At present, laser scanning rapid prototyping equipment, its key parts have: the controller, the laser, the galvanometer, the calibration plate and the substrate have the structure, the function and the principle which are common knowledge technology for common technicians in the rapid prototyping industry.

At present, the calibration of a laser scanning system mostly adopts manual calibration: manufacturing a calibration board matched with the working breadth, wherein the calibration board is provided with a series of theoretical points, laser is applied to the calibration board, and the laser position is observed by human eyes; if the laser does not hit the theoretical position of the calibration plate, manually controlling the galvanometer to move the laser until the laser hits the theoretical position, and recording the current galvanometer data; repeating the process, recording the data of all theoretical positions, and generating a calibration file through software; if the calibration is not ideal, it needs to be repeated for many times.

The manual calibration mode has low calibration precision and low speed, and damages the eyesight of human eyes.

Disclosure of Invention

The utility model aims to provide a not enough to prior art exists, the utility model aims to provide a full-automatic calibration system of laser scanning rapid prototyping equipment and this former's full-automatic calibration method.

The full-automatic calibration system of the laser scanning rapid prototyping equipment comprises a controller 6, a laser 1, a substrate 3, a galvanometer 2 and a surface scanner 5, wherein the controller 6 controls the laser 1, the galvanometer 2 and the surface scanner 5 to work cooperatively;

the controller 6, the laser 1, the galvanometer 2 and the substrate 3 are sequentially adjacent in a front-back direction. The controller 6 controls the laser 1 to emit laser; the laser is controlled by the vibrating mirror 2 to strike the substrate 3 and present a scanning pattern 4 on the substrate 3;

the surface scanner 5 is adjacent to the substrate 3. The surface scanner 5 collects and processes the information of the scanning pattern 4 on the substrate 3 and outputs a calibration file.

The upper surface of the substrate 3 is flat and smooth, and a layer of flat photosensitive paper can also be covered on the upper surface.

The substrate 3, which is a base of the printing workpiece of the rapid prototyping device (or a screen if the rapid prototyping device is a photo-curing device), is made of titanium alloy or stainless steel material.

And the surface scanner 5 is used for identifying the patterns scanned by the laser on the substrate 3, further identifying theoretical points and extracting actual three-dimensional coordinates of the theoretical points.

A calibration method of a full-automatic calibration system of laser scanning rapid prototyping equipment comprises the following steps:

controlling the laser 1 and the galvanometer 2 to scan a series of patterns (such as 7 multiplied by 7 crosses) formed by crosses on the substrate 3 according to theoretical coordinates, wherein the pattern range is equivalent to the maximum forming range of the laser scanning rapid forming equipment;

three-dimensional scanning is carried out on the upper surface of the substrate 3 by using a surface scanner 5 to obtain a three-dimensional model of the upper surface of the substrate 3;

identifying each theoretical point (the central point of each cross) from the three-dimensional model of the upper surface of the substrate 3, and extracting the actual three-dimensional coordinates of each theoretical point;

the center point of the pattern center cross is used as an origin (the coordinates are also (0, 0) during scanning), and the upper surface of the substrate is assumed to be flat, and the actual relative coordinates (two-dimensional) of all the theoretical points relative to the central theoretical point are calculated according to the actual three-dimensional coordinates of each theoretical point;

storing the data of the theoretical coordinates and the actual relative coordinates of all theoretical points into a file required by calibration software, and recording the data as a data file;

using calibration software (the software has the functions of loading a data file, a data file and an original calibration file and calculating a new calibration file), importing the data file, the data file and the calibration file, and calculating and outputting the calibration file;

further, before the step of controlling the laser 1 and the galvanometer 2 to scan a series of patterns composed of crosses on the substrate 3 according to the theoretical coordinates, the method further comprises the following steps: adjusting a laser optical path system to enable the focus of the laser to be positioned on the upper surface of the substrate 3;

further, before the step of controlling the laser 1 and the galvanometer 2 to scan a series of patterns composed of crosses on the substrate 3 according to the theoretical coordinates, the method further comprises: the up-down position of the substrate 3 is adjusted to make the upper surface of the substrate 3 coplanar with the actual molding surface (note: the "actual molding surface" refers to the surface where the laser scanning solidifies the material, which is fixed due to mechanical constraints;

further, before the step of controlling the laser 1 and the galvanometer 2 to scan a series of patterns composed of crosses on the substrate 3 according to the theoretical coordinates, the method further comprises: using a laser 1 to guide light, scanning once to ensure that the pattern is equal to the size of the substrate 3 and the pattern does not exceed the substrate 3;

further, before the step of controlling the laser 1 and the galvanometer 2 to scan a series of patterns composed of crosses on the substrate 3 according to the theoretical coordinates, the method further comprises: if the laser 1 power is too small, no pattern can be left on the substrate 3. The upper surface of the substrate 3 can be covered with photosensitive paper, the flatness of the photosensitive paper can be ensured, and a complete pattern can be left on the photosensitive paper under the appropriate laser power.

The utility model has the advantages that:

the utility model uses the surface scanner 5 to carry out three-dimensional modeling on the substrate 3 and can extract the actual coordinates of the theoretical points, therefore, the laser is not required to be controlled to hit the precise theoretical points, and the calibration process becomes simple and efficient; because the calibration process is completely completed by software, the utility model can complete the full-automatic calibration of the laser scanning rapid prototyping equipment; because the calibration plate does not need to be additionally manufactured, the cost is reduced; because people do not need to check whether the laser hits a theoretical point by eyes, the damage of the laser to the eyes is avoided; therefore, the utility model has the advantages of high speed, high efficiency and no harm to human eyes.

Drawings

FIG. 1 is a schematic view of the structure and working principle of an embodiment of the present invention

In the figure, 1 denotes a laser, 2 denotes a galvanometer, 3 denotes a substrate, 4 denotes a scanning pattern, 5 denotes an area scanner, and 6 denotes a controller.

Detailed Description

The invention will be further described with reference to the accompanying drawings and examples.

Embodiment full-automatic calibration system of laser scanning rapid prototyping equipment

Fig. 1 shows the structure and the working principle of the calibration system of the present embodiment:

the controller 6 controls the whole laser scanning rapid prototyping device. The laser emitted by the laser 1 passes through the galvanometer 2, and the galvanometer 2 controls the laser to be irradiated on the substrate 3 or the photosensitive paper; scanning a pattern 4 on the substrate 3 or the photosensitive paper according to the coordinates of the theoretical points; scanning the actual coordinates of the theoretical points by using a surface scanner 5, and automatically generating a data file storing the theoretical points and the actual coordinate data thereof; then, the calibration software is used for importing a data file and a data file, and calculating and outputting the calibration file.

The power of the laser 1 can be adjusted as required to leave a complete pattern on the substrate 3 (it is also possible to use a photosensitive paper to cover the upper surface of the substrate 3 and to ensure the flatness of the photosensitive paper). If the power of the laser 1 is too low, no pattern can be left on the substrate 3 or the photosensitive paper, and if the laser power is too high, the photosensitive paper can be burnt, and even a fire can be caused.

Claims

1. A full-automatic calibration system of laser scanning rapid prototyping equipment comprises a controller (6), a laser (1), a galvanometer (2) and a substrate (3); it is characterized in that the scanner (5) is provided with a surface; the controller (6) controls the laser (1), the galvanometer (2) and the surface scanner (5) to work cooperatively;

the controller (6), the laser (1), the galvanometer (2) and the substrate (3) are sequentially adjacent in a front-back manner; the controller (6) controls the laser (1) to emit laser; the laser is controlled by the vibrating mirror (2) to hit the substrate (3), and a scanning pattern (4) is presented on the substrate (3);

the surface scanner (5) is adjacent to the substrate (3); the surface scanner (5) collects and processes the information of the scanning pattern (4) on the substrate (3) and outputs a calibration file.

2. The full-automatic calibration system of the laser scanning rapid prototyping apparatus of claim 1, wherein: the substrate (3) is positioned on a base of a workpiece printed by the rapid prototyping equipment; the upper surface of the paper is flat and smooth, or is covered with a layer of flat photosensitive paper.